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WikiPedia: Cường_quốc http://eherald.alp.org.au/articles/0906/natp28-01.... http://post.queensu.ca/~nossalk/papers/hyperpower.... http://www.foreignaffairs.com/articles/61705/ben-w... http://www.ir.rochelleterman.com/sites/default/fil... http://www.upi.com/Business_News/Energy-Resources/... http://www.upi.com/Business_News/Energy-Resources/... http://europa.eu/about-eu/eu-history/founding-fath... http://europa.eu/about-eu/eu-history/founding-fath... http://www.au.af.mil/au/awc/awcgate/army-usawc/str... http://www.au.af.mil/au/awc/awcgate/army-usawc/str...